0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 0000002 - Document - Audit Information link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Consolidated Statements of Operations link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Consolidated Statements of Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Consolidated Statements of Equity link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - Consolidated Statements of Equity (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Organization link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Properties, Net link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Real Estate Joint Ventures link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Investing Receivables link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Debt, Net link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Interest Rate Derivatives link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Redeemable Noncontrolling Interests link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Equity link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Share-Based Compensation and Other Compensation Matters link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Information by Business Segment link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Construction Contract and Other Service Revenues link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - Credit Losses on Financial Assets and Other Instruments link:presentationLink link:calculationLink link:definitionLink 9952173 - Disclosure - Earnings Per Share ("EPS") link:presentationLink link:calculationLink link:definitionLink 9952174 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 9952175 - Disclosure - Schedule III - Real Estate and Accumulated Depreciation link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Properties, Net (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Real Estate Joint Ventures (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Investing Receivables (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Debt, Net (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Interest Rate Derivatives (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Redeemable Noncontrolling Interests (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Share-Based Compensation and Other Compensation Matters (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Information by Business Segment (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Construction Contract and Other Service Revenues (Tables) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Credit Losses on Financial Assets and Other Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Earnings Per Share ("EPS") (Tables) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Organization (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Summary of Significant Accounting Policies - Properties and Impairment (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Summary of Significant Accounting Policies - Intangible Assets on Property Acquisitions (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Summary of Significant Accounting Policies - Lease and Other Property Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Summary of Significant Accounting Policies - Construction Contract and Other Service Revenues (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Summary of Significant Accounting Policies - Share-Based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Summary of Significant Accounting Policies - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Properties, Net - Operating Properties, Net (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Properties, Net - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Properties, Net - Allocation of Acquisition Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Properties, Net - Intangible assets Acquired (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Leases - Lease Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Leases - Percentage of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Leases - Payments to be Received (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Leases - Payments to be Received (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Leases - Lessee Arrangements (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Leases - Property Right-of-Use Assets and Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Leases - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Leases - Property Lease Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Leases - Supplemental Cash Flow Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Leases - Payment Due on Property Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Leases - Payment Due on Property Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Real Estate Joint Ventures - Investments in Consolidated Real Estate Joint Ventures (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Real Estate Joint Ventures - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Real Estate Joint Ventures - Unconsolidated Real Estate Joint Ventures (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Investing Receivables - Components of Investing Receivables (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Investing Receivables - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Debt, Net - Schedule of Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Debt, Net - Debt Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Debt, Net - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - Debt, Net - Fair Value of Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - Debt, Net - Schedule of Interest Expense Recognized (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - Interest Rate Derivatives - Schedule of Key Terms and Fair Values of Interest Rate Swap Derivatives (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - Interest Rate Derivatives - Schedule of Fair Value and Balance Sheet Classification of Interest Rate Derivatives (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - Interest Rate Derivatives - Schedule of Effect of Interest Rate Derivatives on Consolidated Statements of Operations and Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - Interest Rate Derivatives - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - Redeemable Noncontrolling Interests (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - Equity (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - Share-Based Compensation and Other Compensation Matters - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955564 - Disclosure - Share-Based Compensation and Other Compensation Matters - Share-Based Compensation Cost (Details) link:presentationLink link:calculationLink link:definitionLink 9955565 - Disclosure - Share-Based Compensation and Other Compensation Matters - Restricted Share and TB-PIU Transactions Under the Entity's Share-Based Compensation Plans (Details) link:presentationLink link:calculationLink link:definitionLink 9955566 - Disclosure - Share-Based Compensation and Other Compensation Matters - Grants to Senior Management (Details) link:presentationLink link:calculationLink link:definitionLink 9955567 - Disclosure - Share-Based Compensation and Other Compensation Matters - Percentile Grant and Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 9955568 - Disclosure - Share-Based Compensation and Other Compensation Matters - Deferred Share Awards (Details) link:presentationLink link:calculationLink link:definitionLink 9955569 - Disclosure - Information by Business Segment - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955570 - Disclosure - Information by Business Segment - Segment Financial Information for Our Reportable Segments (Details) link:presentationLink link:calculationLink link:definitionLink 9955571 - Disclosure - Information by Business Segment - Reconciliation of Segment Revenues to Total Revenues (Details) link:presentationLink link:calculationLink link:definitionLink 9955572 - Disclosure - Information by Business Segment - Reconciliation of UJV NOI Allocable to COPT Defense to Equity in Income (Loss) of Unconsolidated Entities (Details) link:presentationLink link:calculationLink link:definitionLink 9955573 - Disclosure - Information by Business Segment - Computation of NOI from Service Operations (Details) link:presentationLink link:calculationLink link:definitionLink 9955574 - Disclosure - Information by Business Segment - NOI Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 9955575 - Disclosure - Information by Business Segment - Assets Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 9955576 - Disclosure - Construction Contract and Other Service Revenues - Construction Contract and Other Service Revenues by Compensation Arrangement (Details) link:presentationLink link:calculationLink link:definitionLink 9955577 - Disclosure - Construction Contract and Other Service Revenues - Percentage of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955578 - Disclosure - Construction Contract and Other Service Revenues - Accounts Receivable, Contract Asset and Contract Liability (Details) link:presentationLink link:calculationLink link:definitionLink 9955579 - Disclosure - Construction Contract and Other Service Revenues - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955579 - Disclosure - Construction Contract and Other Service Revenues - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955580 - Disclosure - Credit Losses on Financial Assets and Other Instruments - Allowance for Credit Loss (Details) link:presentationLink link:calculationLink link:definitionLink 9955581 - Disclosure - Credit Losses on Financial Assets and Other Instruments - Credit Risk Classification (Details) link:presentationLink link:calculationLink link:definitionLink 9955582 - Disclosure - Earnings Per Share ("EPS") - Schedule of Calculation Of Numerator and Denominator in Basic and Diluted Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955583 - Disclosure - Earnings Per Share ("EPS") - Schedule of Securities Excluded From Computation Of Diluted Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955584 - Disclosure - Earnings Per Share ("EPS") - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955585 - Disclosure - Commitments and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 9955586 - Disclosure - Schedule III - Real Estate and Accumulated Depreciation (Details) link:presentationLink link:calculationLink link:definitionLink 9955587 - Disclosure - Schedule III - Real Estate and Accumulated Depreciation (Rollforward) (Details) link:presentationLink link:calculationLink link:definitionLink